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1 - attempted fix of uninitialized variable

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2 - indented and edited to fit better within 80 columns
3 - fixed possible buffer overflow in the service name lookup function
pull/1/head
Daniel Stenberg 19 years ago
parent af27d8743d
commit 209e8147a1
1 changed files with 44 additions and 28 deletions
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  1. 72
      ares_getnameinfo.c

72
ares_getnameinfo.c
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@ -123,7 +123,7 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa, socklen_t
char *service = NULL; char *service = NULL;
ipbuf[0] = 0; ipbuf[0] = 0;
/* Specifying not to lookup a host, but then saying a host /* Specifying not to lookup a host, but then saying a host
* is required has to be illegal. * is required has to be illegal.
*/ */
if (flags & ARES_NI_NAMEREQD) if (flags & ARES_NI_NAMEREQD)
@ -163,18 +163,18 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa, socklen_t
niquery->callback = callback; niquery->callback = callback;
niquery->arg = arg; niquery->arg = arg;
niquery->flags = flags; niquery->flags = flags;
if (sa->sa_family == AF_INET) if (sa->sa_family == AF_INET)
{ {
niquery->family = AF_INET; niquery->family = AF_INET;
memcpy(&niquery->addr.addr4, addr, sizeof(addr)); memcpy(&niquery->addr.addr4, addr, sizeof(addr));
ares_gethostbyaddr(channel, &addr->sin_addr, sizeof(struct in_addr), AF_INET, ares_gethostbyaddr(channel, &addr->sin_addr, sizeof(struct in_addr), AF_INET,
nameinfo_callback, niquery); nameinfo_callback, niquery);
} }
else else
{ {
niquery->family = AF_INET6; niquery->family = AF_INET6;
memcpy(&niquery->addr.addr6, addr6, sizeof(addr6)); memcpy(&niquery->addr.addr6, addr6, sizeof(addr6));
ares_gethostbyaddr(channel, &addr6->sin6_addr, sizeof(struct in6_addr), AF_INET6, ares_gethostbyaddr(channel, &addr6->sin6_addr, sizeof(struct in6_addr), AF_INET6,
nameinfo_callback, niquery); nameinfo_callback, niquery);
} }
} }
@ -194,9 +194,11 @@ static void nameinfo_callback(void *arg, int status, struct hostent *host)
if (niquery->flags & ARES_NI_LOOKUPSERVICE) if (niquery->flags & ARES_NI_LOOKUPSERVICE)
{ {
if (niquery->family == AF_INET) if (niquery->family == AF_INET)
service = lookup_service(niquery->addr.addr4.sin_port, niquery->flags, srvbuf); service = lookup_service(niquery->addr.addr4.sin_port,
niquery->flags, srvbuf);
else else
service = lookup_service(niquery->addr.addr6.sin6_port, niquery->flags, srvbuf); service = lookup_service(niquery->addr.addr6.sin6_port,
niquery->flags, srvbuf);
} }
/* NOFQDN means we have to strip off the domain name portion. /* NOFQDN means we have to strip off the domain name portion.
We do this by determining our own domain name, then searching the string We do this by determining our own domain name, then searching the string
@ -212,7 +214,7 @@ static void nameinfo_callback(void *arg, int status, struct hostent *host)
char *end = ares_striendstr(host->h_name, domain); char *end = ares_striendstr(host->h_name, domain);
if (end) if (end)
*end = 0; *end = 0;
} }
} }
niquery->callback(niquery->arg, ARES_SUCCESS, host->h_name, service); niquery->callback(niquery->arg, ARES_SUCCESS, host->h_name, service);
return; return;
@ -234,9 +236,11 @@ static void nameinfo_callback(void *arg, int status, struct hostent *host)
if (niquery->flags & ARES_NI_LOOKUPSERVICE) if (niquery->flags & ARES_NI_LOOKUPSERVICE)
{ {
if (niquery->family == AF_INET) if (niquery->family == AF_INET)
service = lookup_service(niquery->addr.addr4.sin_port, niquery->flags, srvbuf); service = lookup_service(niquery->addr.addr4.sin_port,
niquery->flags, srvbuf);
else else
service = lookup_service(niquery->addr.addr6.sin6_port, niquery->flags, srvbuf); service = lookup_service(niquery->addr.addr6.sin6_port,
niquery->flags, srvbuf);
} }
niquery->callback(niquery->arg, ARES_SUCCESS, ipbuf, service); niquery->callback(niquery->arg, ARES_SUCCESS, ipbuf, service);
return; return;
@ -245,7 +249,8 @@ static void nameinfo_callback(void *arg, int status, struct hostent *host)
free(niquery); free(niquery);
} }
static char *lookup_service(unsigned short port, int flags, char *buf) static char *lookup_service(unsigned short port, int flags,
char *buf) /* 33 bytes buffer */
{ {
if (port) if (port)
{ {
@ -265,7 +270,7 @@ static char *lookup_service(unsigned short port, int flags, char *buf)
int len = 4096; int len = 4096;
#elif GETSERVBYPORT_R_ARGS == 4 #elif GETSERVBYPORT_R_ARGS == 4
struct servent_data sed; struct servent_data sed;
#endif #endif
if (flags & ARES_NI_UDP) if (flags & ARES_NI_UDP)
proto = "udp"; proto = "udp";
else if (flags & ARES_NI_SCTP) else if (flags & ARES_NI_SCTP)
@ -275,24 +280,33 @@ static char *lookup_service(unsigned short port, int flags, char *buf)
else else
proto = "tcp"; proto = "tcp";
#ifdef HAVE_GETSERVBYPORT_R #ifdef HAVE_GETSERVBYPORT_R
#if GETSERVBYPORT_R_ARGS == 6 #if GETSERVBYPORT_R_ARGS == 6
if (getservbyport_r(port, proto, se, buf, len, &ret)) se = &ret;
se = NULL; if (getservbyport_r(port, proto, se, buf, len, &ret))
#elif GETSERVBYPORT_R_ARGS == 5 se = NULL;
se = getservbyport_r(port, proto, se, buf, len); #elif GETSERVBYPORT_R_ARGS == 5
#elif GETSERVBYPORT_R_ARGS == 4 se = getservbyport_r(port, proto, se, buf, len);
if (getservbyport_r(port, proto, se, &sed) == -1) #elif GETSERVBYPORT_R_ARGS == 4
se = NULL; se = &sed;
#else if (getservbyport_r(port, proto, se, &sed) == -1)
/* Lets just hope the OS uses TLS! */ se = NULL;
se = getservbyport(port, proto);
#endif
#else #else
/* Lets just hope the OS uses TLS! */ /* Lets just hope the OS uses TLS! */
se = getservbyport(port, proto); se = getservbyport(port, proto);
#endif #endif
if (se && se->s_name) #else
strcpy(buf, se->s_name); /* Lets just hope the OS uses TLS! */
se = getservbyport(port, proto);
#endif
if (se && se->s_name) {
size_t len = strlen(se->s_name);
if(len < 33) {
strcpy(buf, se->s_name);
}
else
/* too big name to fit the buffer */
buf[0]=0;
}
else else
sprintf(buf, "%u", ntohs(port)); sprintf(buf, "%u", ntohs(port));
} }
@ -302,14 +316,16 @@ static char *lookup_service(unsigned short port, int flags, char *buf)
} }
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
static char *append_scopeid(struct sockaddr_in6 *addr6, unsigned int flags, char *buf) static char *append_scopeid(struct sockaddr_in6 *addr6, unsigned int flags,
char *buf)
{ {
char tmpbuf[IF_NAMESIZE + 1]; char tmpbuf[IF_NAMESIZE + 1];
tmpbuf[0] = '%'; tmpbuf[0] = '%';
#ifdef HAVE_IF_INDEXTONAME #ifdef HAVE_IF_INDEXTONAME
if ((flags & ARES_NI_NUMERICSCOPE) || (!IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr) if ((flags & ARES_NI_NUMERICSCOPE) ||
&& !IN6_IS_ADDR_MC_LINKLOCAL(&addr6->sin6_addr))) (!IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr)
&& !IN6_IS_ADDR_MC_LINKLOCAL(&addr6->sin6_addr)))
{ {
sprintf(&tmpbuf[1], "%u", addr6->sin6_scope_id); sprintf(&tmpbuf[1], "%u", addr6->sin6_scope_id);
} }

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